Why isn't anything written into the game to prevent BOP drops for classes that aren't even in the game?

Yeah, with so many people having 2 or more characters, I would love to see a new class of binding called Account-Bound BOE. That way you can still only use it for one toon (instead of passing it around between your multiple toons), but that way we don't get so frustrated by the RNG. Other day ran Naxx, normally I bring my resto druid, but needed my warlock for DPS in this case. There were 4 or 5 pieces of resto druid gear that dropped, 3 of which would have been upgrades, which nobody else wanted. What a waste, and how frustrating not only for me but for everyone else who saw epics wasted and/or sharded when they knew they had asked me to switch to another toon for the benefit of the raid. =(

Small point here but think about what would happen to the high end enchanting market if only epics that people needed were dropped. There'd be an Abyss Crystal drought and nothing you could do about it save DE'ing something someone actually needed.

Its called Waaahhh! We have an officer in the guild I'm in with three alts who cries (this is a grown man btw) every time any piece of loot drops that any of his alts could have ever possibly equipped. It got to the point this week that we lost our guilds top healer because she was finally fed up with listening to him be a whiny little bee-otch.

This is why I always tell people, do not stop running your main for any reason until it is geared to your liking.

If you are not running your main, that is the choice you made, and possibly seeing that one piece that your main needs drop is the consequence. If you can't handle that, perhaps Hello Kitty Island Adventure would be a better game for you. Otherwise - grow up, man up and stfu.